About a month ago I bought an acidifying water aquarium, just this : TropicalDrops 100 ml of SHG.
If we use 1 ml per 10 liters of water before you use all the water of the aquarium and then only on that of the partial changes (I change about 15% every week).

I find it a good product, slightly lowers the pH and especially does not color the water, not the darker, as it happened to me with a couple of products from competing brands. At least I do not like the amber water, also because it takes away too much light to the plants, even though they may in some Amazonian rivers the water is very dark, dark like tea!

Be careful, however, its use in conditions of very low KH, say under 2 °, maybe 3 as indicated on the packaging is also exaggerated, because it could create the conditions for a sharp drop in PH ... especially in association with administration of CO2, and this reason could quickly lead to death of the fish we have in the aquarium!

Do you have experience with other "tropicalizzanti"? Have you tried this same product? How have you found? Effects "collateral" recorded?